Samuel s



(No Model.)

s. s. VAIL. v

SAW GUIDE.

- Patented Oct. Z6, 1886.

"Jlmmmmwi lavemtor:

UNITED STATES PATENT OFFICE..

SAMUEL S. VAIL, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE CURTIS d5 C0.

' MANUFACTURING COMPANY, OF SAME PLACE.

SAW-GUIDE.

SPECIFICATION .farming pari; of Letters Patent No. 351,672I datedOctober 26, 1886.

Applicationtiled March 1, 1886. Serial No. 193,702. No model.)

To all whom, it may concern:

Be it known that I, SAMUEL S. VMI., ofthe city of St. Louis, in theState of Missouri, .have invented a certain new and useful Improvementin Saw`Guides, of which the following is a full, clear. and exactdescription, reference being had to the accompanying drawings, formingpart of this specification, and in which- Figure l is an end View oftheguide. Fig. 2 is a side view of the guide, showing the saw and t-hetimber to which the guide is attached in section at line 2 2, Fig.1,'with top and bottom of the saw broken away. Fig. 3 is a top View ofthe guide with part of the saw shown in horizontal section. Fig. 4 is anenlarged vertical section at 4 4, Figs. 2 and 3. Fig. 5 is an enlargedcross-section at 5 5, Fig. 3.

This is a guide having two jawsadj ustable relatively to cach other, andalso adjustable in their cannon-bearing by a single adjustingscrew.

A is part of a circular saw, and. B is one of the longitudinal timbersof the bed-frame.

C is the bearing-box of the gage-shaft, the box having lugsD, withlongitudinalslots D', through which pass the screw-bolts E,by which thebox C is secured to the timber B. The

,shaft is formed of two semi-cylindrical memupon the member G.Thesemi-cylindrical member F has alu g; F2, having a screw-threadedhole, in which works the adj usting-screw H. This screw may be rigidlyconnected with the member F by means of y a lock-nut, I, which turns onthe screw, and may be made to bearv against thelug F2 for this purpose.The point of the screw H bears against alug, G2, projecting from theiiat side of the member G, so that when the screw H is moved inward inthe lug F2 the jaw F is made to approach the jaw G. This lug G2 moves ina recess, F3, of the member F.

J is a hand-nut working on the screw H, and having a hand-wheel, J, bywhich it may be turned. The nut has a circumferenti al groove occupiedby the prongs of an upright fork, K,

The jaws may be turned down in a horizontal or working position, asshown in full lines, or may be thrown upward, to disengage them from thesaw, as shown in dotted lines in Fig. 1.

To hold the guide in working position, the member F has a longitudinalslot at f', which is entered by a key, N, working in a mortise of theboXC, the key being placed in its inner position, as shown in full lines,to lock the guide in working position,and drawn outward, as seen indotted lines in Fig. l, to allow the jaws to be turned up, as aforesaid.

The operation is as follows: To set the two jaws outward or inwardwithout changing their relative position, thelock-nut M is slacked up,the lock-nut I being tight against the lug F2. Inthis case the screw Hwill not turn with the hand-nut J, as it is turned in the fork K, and ofcourse the screw and the shaft with the jaws will be moved endwise. Onthe other hand, when the lock-nut M is made fast against the hand-nut J,and the nut I is made loose from the lug F2, the screw H turns with thenut J, and the jaw F is moved inward or outward,

4the jaw G remaining at rest, or at least not O is a bar supporting theguide-jaws in Working position.

I am aware that one jaw of a saw-guide has been secured to and carriedby a shaft, which is of cylindrical form on its exterior, excepting foradeeplongitudinal groove cnt therein for the reception of a slidecarrying the other jaw, said shaft being mounted in a suitablebearing-box, and said jaws adjusted and held to the proper distanceasunder by means of a setscrew tapped into one and swiveled to theother. This, however, is not the equivalent of my invention. This methodof forming the shank of the guide of two parts (one member nearlycylindrical and having a longitudinal groove therein, and the other ofsuch size and shape as to fill said groove and complete the cylindricalform of said shank) is mueh more expensive than forming the shaft of twosemicylindrical members.

I claim as my invention 1. In a saw-guide, the combination, with the twojaws F and G, of the two members F and G, to which said jaws arerespectively secured, the outer surface of each of said members beingformed on an arc and the two uniting to form a cylindrical shaft, thelug F2, formed on the member F, and having the screw-threadedperforation, the screw H, passing through said lug, and the lug G2,formed on the member G, against which the extremity of said screw bears,substantially as set forth.

2. In a saw-guide, the combination of the jaws, a cylindrical shaft towhich they are secured, having a groove, f', the two-part journal-box C,having a mortise between its meeting surfaces, the key N, fitting insaid mortise and having an elongated slot or perforation, and the boltby which the two parts of the j ournal-box are secured together passingthrough said slot, substantially as and for the purposes set forth.

3. In combination with the two jaws F' and G and the two members F andG, to which they are respectively secured, ofthe screw H, tapped throughalng Qn one member and bearing upon the other, a hand-nut on said screwhaving a circumferential groove, a fork, K, engaging said groove, forconfining the nut against movementandalock-nut on said screw foroptionallyloeking said screw to the member For to the hand-nnt J,substantially as and for the purpose set forth.

4. In combination, the jaws F and G', the semi-cylindrical members F andG, having the groove F3 and lug G2, respectively, the lug F,

.secured to the member F, the screw H, tapped through said lug, and thehandnut J, and the lock-nut M, for locking said nut to the screw,

substantially as and for the purposes set forth. 6:

SAMUE L S. VAIL.

Witnesses:

SMIL. KNIGHT, BENJN. A. KNIGHT.

